JPS5917042A - V-belt transmission device - Google Patents

Abstract

PURPOSE:To transmit a large power reliably and efficiently by bringing V- shaped members fastened to a flexible endless member into contact with each other through slender roller membrs so that the V-shaped members can be swayed nimbly. CONSTITUTION:A V-belt 6 is suspended across grooves 3, 5 of a driving V-pulley 2 and a driven V-pulley 4 of a stepless speed changer 1. The V-belt 6 comprises many V-shaped metal members 7, needle rollers 12 inserted between many V-shaped metal members 7 as slender roller members, and a flexible endless member 13 made by overlapping many endless thin steel plates with a fixed width fastening the periphery of connection units each of which consists of the V-shaped metal member 7 and needle roller 12. The V-shaped metal member 7 is swayed nimbly by the needle roller 12, and in addition, the V-shaped metal member 7 and flexible endless member 13 do not slide relatively, thereby the V-belt 6 does not generate heat and its power transmission efficiency is high.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a V-belt transmission device that transmits power using a V-belt having a square cross section.

V-belt transmission devices used in continuously variable transmissions, etc., are suitable for transmitting large amounts of power because they can obtain greater frictional force than ordinary flat belts due to the imitation of the bobbin and both inclined grooves, but they are suitable for transmitting large amounts of power. Because of this, rubber MV belts
It may not be able to withstand the transmitted power.

Furthermore, since the rubber V-belt is highly elastic, it has a large hysteresis loss.

A metal V-belt transmission device has been developed to overcome these inconveniences, one example of which is the metal V-belt transmission device shown in FIGS. 1 and 2.

The metal V-belt is constructed by integrally attaching a steel power transmission piece member 02 to a large number of endless thin steel plate belts 01 stacked one on top of the other in the thickness direction through locking portions 03 at both ends in the longitudinal direction. The metal V-belt is spanned over a driving V-pulley O11 and a driven V-pulley 05.

However, the metal V-belt transmission shown in FIGS. 1 and 2 is heavy-duty, and the bridge members slide into contact with each other in the rotating portion, resulting in high friction and poor efficiency. Also, do the pieces rotate? A chamfer 02a corresponding to the diameter 1' is required, making machining troublesome.In addition, there are drawbacks in that if the assembly direction is incorrect, the rotation cannot be linked.

The present invention relates to a V-belt transmission device that overcomes the above-mentioned drawbacks, and its purpose is to provide a durable V-belt transmission device that is easy to process and capable of reliably and efficiently transmitting large amounts of power. High quality V-belt den Qti+ device? It is in the point of providing.

Embodiments of the present invention illustrated in FIGS. 3 to 7 will now be described.

Reference numeral 1 designates a continuously variable transmission for a motorcycle. In the transmission 1, a V-belt 6 is spanned across each surface 3.5 of a driving V-pulley 2 and a driven V-pulley 4.

Further, the V-belt 6 includes a large number of V-shaped metal parts vJ7, a needle roller 12 which is an elongated roller part interposed between the same number of V-shaped metal members 7, a same number of V-shaped metal members 7, and a needle roller J2. A flexible endless member 1 made by stacking a number of endless N steel plates with a certain ri to tighten the outer periphery of a connected unit made of
3 and more.

Furthermore, both side surfaces 8 of the v-shaped metal member 7 are formed at a predetermined angle of inclination.
It is formed to be symmetrically inclined so as to be in contact with the groove 3.5 of the pulley 2.4, and the front and rear end surfaces 9 of the same square metal member 70 are formed to be parallel, and the inner front and rear end surfaces 9a of the metal member 70 are parallel to each other. A circular arc-shaped groove 10 having a length of 4° in the IJ direction and a radius of curvature r is formed in the V-shaped metal member 7, and a rectangular notch 11 is formed in the outer part of the V-shaped metal member 7. has been done.

Further, in the needle roller 12, the length 12 of the circular groove 10 is shorter than the length l of the circular circular groove 10, and the circular circular groove i
The radius r2 is set smaller than the radius of curvature r1 of 10.

Since the embodiments shown in FIGS. 3 to 7 are constructed as described above, the flexible fB (from the inside of the end side 13 to the outside) made of endless slotted steel plates stacked in multiple layers Move the V-shaped metal member 7, fit the notch 11 of the same ■-shaped metal member 19 into the front flexible endless member 13, and insert the needle roller into the circular groove 10 of the same ■-shaped metal member 7. 12,
This process is repeated over the entire circumference of the flexible endless section 13.

Next, in a state where this iJ flexible endless member 3 is cut into a circular shape G,
Using a jig or the like, a force is applied to both ■-shaped metal members 7 to separate them from each other in the part where the needle roller 12 is not interposed +Frj, and a phase shift between the two sounds 1 to vJ7 is applied. By engaging the last needle roller 12 in the arc-shaped groove 10 of the belt 6, the belt 6 can be erected in the thread II.

Since the V-belt 6 is erected by the thread H in this way, nJ
The flexible endless member 3 holds the needle roller 12 in the arcuate groove 10 of the V-shaped metal part side 7, so that the V-belt 6 is Needle roller 12 will not fall off even if it is located between pulleys 2 and 4, as well as when it is bent in contact with it.

In addition, when transmitting 101 force, in addition to transmitting power by normal belt tension, the V-shaped metal member 7, which is in contact with the groove 3 of the drive V-pulley 2 and transmits torque, is located on the moving side of the V-belt 6. Compressive force is transmitted to the V-shaped metal member 7 on the moving side via the needle roller 12, and this compressive force is transmitted to the V-groove 50 of the driven V-pulley 4 via the needle roller 12 and the V-shaped metal member 7 one after another. The power is transmitted to the V-shaped metal member 7 that is in contact with it, and thus the power is transmitted from the driving pulley 2 to the driven pulley 4.

Furthermore, since the adjacent V-shaped metal members 7 are brought into contact via the arc-shaped groove 10 and the ten needle roller 12, the V-shaped metal members 7
The bending deformation involves only the bending of the flexible endless member 13, and the ■-shaped metal member 7 can be easily swung by the needle roller 12, and the v-shaped metal member 7 and the uJ flexible endless member 13
Since there is no relative G slippage, the V-belt 6 does not generate heat and the power transmission efficiency is high.

Furthermore, since the radius of curvature r1 of the circular arc groove 10 is larger than the radius r2 of the needle roller 12, the V-shaped metal member 7 and the needle roller 12 come into rolling contact, and as a result,
Wear and friction loss between the V-shaped metal member 7 and the needle roller 12 are small.

In addition, the V-shaped metal t71; the thread 7 and the flexible endless member 13 do not slide against each other and are not worn, so the durability is high.

Moreover, both side surfaces 8 of the V-shaped metal member 7 whose front and rear end surfaces 9 are parallel to each other.
is inclined in a V-shape, and a circular groove 1 is formed on the inner front and rear end surfaces 9a.
Since the V-shaped metal member 7 can be constructed simply by forming 0,
High productivity and low cost.

In the embodiment described above, the inner part of the V-shaped metal part cavity 7 is
Although the circular arc-shaped groove 10 formed in the groove 10 does not reach both side surfaces 8, in order to simplify machining, as shown in FIG. You may complete one.

Further, in the above embodiment, as shown in FIGS. 9 and 10, the V-shaped metal f! The rubber connecting member 14 is filled in the J notch 11 of the rlI cutout 7, and the ■-shaped metal part @7 and the flexible endless member 13 are connected. If they are integrally connected to each other by the connecting member 14, the movement of the V-shaped metal part side 7 in the direction perpendicular to the longitudinal force of the V-belt 6 between the pulleys 2 and 4 can be reduced by 1 (IJ, flexible To prevent contact between the endless member 13 and the IJJ missing IJ.

Furthermore, in the above embodiment, a large number of endless thin steel plates were stacked, but as shown in FIGS. 11 and 12, five
When the endless metal lobes 15 (synthetic fiber lobes may be used) and the lobes 15 are integrally covered, the rubber connecting member 1 is buried in the notch 11 of the V-shaped metal member 7.
6 may be used, and the same effects as in the above embodiment can be achieved.

Furthermore, the flexible endless member may be composed of a chain or the like.

Further, in the embodiment described above, the needle roller 12 whose generating line is a parallel straight line was used as the elongated roller member, but as shown in FIG. 13 or 14, the elongated roller member 17.
The elongated roller members 17 and 18 may be formed on a rotating body in which the generatrix 18 is a centrally symmetrical broken line or curved line.

In the present invention, in a V-belt transmission device that spans between a driving V-boot and a driven pulley and transmits power between the two pulleys, a plurality of V-shaped portions that are in contact with the boob p are mutually connected to elongated roller members. At the same time, the outer periphery of the connecting unit consisting of the same ■-shaped member and the elongated roller member was tightened via a flexible endless member, so that the v-shaped part lunar phase J1.
It rolls and rubs without sliding friction, so it does not generate heat, has little power loss, has high power transmission efficiency, and has a large delivery force.

Further, in the present invention, since it is not necessary to perform any special processing on the v-shaped member, processing silk is easy and the cost is low.

[Brief explanation of the drawing]

Figure 1 is a side view of a conventional V-belt transmission, Figure 2 is a cross-sectional view taken along line II-II in Figure 1, and Figure 3 is a side view of a conventional V-belt transmission.
The figure is a side view illustrating an embodiment of the V-belt transmission device according to the present invention, and FIGS. Plan, No. 61
The figures are a vertical side view of FIG. 3, FIG. 7 is a perspective view of the V-shaped metal member of the same embodiment, FIG. 8 is a perspective view of the V-shaped metal member of another embodiment, 11 and 12 are cross-sectional views and longitudinal cross-sectional views of still another embodiment, and FIG. 13 and FIG. FIG. 14 is a perspective view of an elongated roller member having a different shape in each of the embodiments. ■... Continuously variable transmission for motorcycles, 2... Drive V pulley, 3... V groove, 4... Driven ■ pulley, 5... ■
Groove, 6...V belt, 7...V-shaped metal member, 8...
・Both sides, 9... Front and rear end surfaces, 9a... Inner front and rear end surfaces, 10... Circular groove, 11... Notch, ]2...
Needle roller, 13...Flexible endless member, 14...
・Rubber connecting member, 15... Endless lobe, 16...
Rubber connecting member, 17.18...Elongated roller member. Agent Patent attorney Ehara Mogai 1 person Fan 13 Figure 17 Fan 14 Figure 8

Claims (1)

[Claims] In a V-belt transmission device that spans one drive pulley and one driven pulley and transmits power between the two boosters, a large number of V-shaped sections in contact with the pulleys are mutually elongated. A V-belt transmission device characterized in that when the V-shaped member and the elongated roller member are brought into contact with each other via the roller portion side, the outer periphery of the connecting unit made of the same V-shaped member and the elongated roller member is tightened via a flexible endless member. 2. The V-shaped member is characterized in that four circular arc-shaped parts are formed approximately at the center of both sides, and the carved members are brought into contact with each other at the four circular circular parts via the elongated roller member. Patented V-belt transmission device. Claims characterized in that the cross-sectional shape of the elongated V-shaped roller member is such that the radius of curvature of the circular concave portion formed on both sides of the V-shaped member is set to be larger than the radius of the elongated roller portion side. The V-belt transmission device according to item 2.